ALL HARD-SURFACING APPLICATIONS
|PRODUCT NAME & SUGGESTED APPLICATIONS
|STRATA 11 - Gas welding on valves, cams, conveyors, cast iron or stainless steel offering excellent resistance to severe abrasion, corrosion or galling.
|STRATA 111 - For building up of earth moving and mining equipment e.g. crusher jaws,
|STRATA 121 - Tools Trimming Dies, Punches, Shears, Cutting Edges, Overlays
|STRATA 135 - Augers Screws Conveyers, Scrapers, Paddles, Wear Pads
|STRATA 147 - For overlaying surfaces subjected to metal to metal wear, frictional wear or sever earth scouring under low stress conditions. Other applications are; tube mill guides, cultivator shovels, plough shear and discs, frictional clutches, rolling mill guides, ore chutes, etc.....
|STRATA 155 - Post Hole Diggers, Mixer Blades, Dredger Teeth
|STRATA 171 - Plough Shares, Shovel Teeth, Conveyor Buckets
|STRATA 186 - Bulldozer Blades, Crusher Jaws, Dies, Excavator Teeth
|STRATA 192 - Manganese Steels, Rail and Road Construction Equipment
Hardsurfacing provides protection against abrasion, corrosion, impact, heat friction and other wear. In the selection of the proper type of hardsurfacing material, the question should not be 'which is the hardest build-up alloy?' but which allow wears the longest under the specific conditions?
Experience shows that the relative abrasion resistance of hardsurfacing alloys is due to the amount of metal carbides present in the alloy. The more carbides, the greater the resistance to wear.These carbides are natural chemical components, formed by the union of one or more of about a dozen elements, among which are Tungsten, Chromium, Molybdenum etc. Such elements are known as carbide-formers, because they have a great tendency to join with the carbon in the molten metal to form crystals of definite shape. Because all carbides are hard and brittle, a cushioning material known as the Matrix is as important to the service life of the hardsurfacing alloy, as the carbide. in most cases iron is used to form the matrix. Where corrosion or high temperatures are encountered, nickel or cobalt may form the matrix.
Before hardsurfacing, it is often necessary to restore a worn part to its original size and contour. Generally this cannot be done with hardsurfacing alloys, particularly on badly worn parts where a great amount of rigid, sound base for the hard material overlay in deposits made by electric arc welding. It can be kept to a minimum by proper heat control (low amperage) and is usually eliminated in the third weld-layer.
Stresses can and do frequently cause failures in the part to be hard surfaced, especially hard base metals. Pre-heating or depositing cush ioning alloys with a high rate of elongation are proven techniques for success. Apply alloys with at least a 10 Rockwell C difference in hard ness when two parts that come in contact with each other are to be surfaced. The economy of hardsurfacing has never been more proven mining industries. Re-building and hardsurfacing very often save the creased efficiency and output (less down time).
Many variables determine the final selection of the hardsurfacing alloy which is best for your situation (whether work is in granite, sandstone, or limestone; or whether the application involves impact or sliding abrasion, etc.). Keep in mind that down-time is the biggest cost factor. The savings you will realise is in increased service life of your parts be fore re-welding is required. Check the data sheets for the correct Strata hardsurfacing material that is best for your application or need.
THE MOST COMMON WAYS METALS WEAR
is the result of two or more materials rubbing against each other.
Low Stress Abrasion
is caused by the action of small particles such as sand and dust moving across the metal surface gouging out small fragments.
High Stress Abrasion
is basically the same as low stress abrasion with the addition of a compressive force.
is a combination of high stress abrasion and abrasion caused by impact, leading to plastic flow in the base metal.